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A250531 Number of (n+1)X(3+1) 0..3 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction 1
3958, 44017, 393910, 3091263, 21783369, 142934266, 885728348, 5269466799, 30337133947, 170444570767, 938858272263, 5094247207831, 27305253854913, 144985807285630, 763985644924271, 4002062352221853, 20864575519057800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A250536

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical recurrence of order 65

FORMULA

Empirical recurrence of order 65 (see link above)

EXAMPLE

Some solutions for n=2

..1..1..2..3....0..0..1..3....0..3..1..3....0..1..1..2....0..0..2..2

..3..2..2..3....1..1..1..3....3..1..3..3....0..1..1..3....1..1..2..2

..0..3..3..3....3..3..3..1....0..3..3..3....0..2..1..3....0..2..1..2

CROSSREFS

Sequence in context: A059666 A230707 A230617 * A319800 A007038 A034599

Adjacent sequences:  A250528 A250529 A250530 * A250532 A250533 A250534

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 24 2014

STATUS

approved

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Last modified May 25 17:48 EDT 2022. Contains 354071 sequences. (Running on oeis4.)